The Flipper is a projectile item in Super Smash Bros. Melee, originating from the NES game Balloon Fight. After it travels a certain distance, it stops in mid-air. When hit, it spins either slowly or quickly (depending on either the speed knockback when contacted, or the strength of the attack), blocking passage and causing light (though generally repeated) damage when touched. Aside from causing general havoc in a fray, they can also be placed strategically at integral locations, such as ledges or against walls. This will prevent opponents from recovering, or not allow them to pass through certain points. The downfalls of this item are that can be avoided with relative ease and has a relatively short duration on the field.
When used on moving stages (such as Big Blue, Rainbow Cruise, Poké Floats, etc.), the Flipper will continue move with the background instead of remaining stationary. This most apparent on Big Blue, where the Flipper hangs still for a split-second, then races off screen as the Falcon Flyer and racers speed away from it.